arshilkxwork commented on PR #3357:
URL: https://github.com/apache/hugegraph/pull/3357#issuecomment-6209849833

   Thanks for the review. Addressed in 1ae51c92d: `hg.stores` now reports the 
size of the store list the per-store refresh just read, so a scrape scans the 
store prefix once instead of twice. On a failed read it keeps its last value, 
like the per-store gauges, where it used to report `0`.
   
   `testPrometheusScrape` counts the reads: two scrapes in one refresh interval 
read the store list once and print `hg_stores 1.0`. `hg-pd-service` tests: 21, 
0 failures.
   
   The paired doc PR, apache/hugegraph-doc#531, now points at this commit; its 
text did not need changes.
   


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